Nanoscale Dehydrogenation Observed by Tip-Enhanced Raman Spectroscopy
Nanoscale Dehydrogenation Observed by Tip-Enhanced Raman Spectroscopy
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DOI：
10.1021/acs.jpcc.7b03352
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发表时间：
2017-08-24
影响因子：
3.7
通讯作者：
Kuwahara, Yuji
中科院分区：
文献类型：
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作者：
Chaunchaiyakul, Songpol;Setiadi, Agung;Kuwahara, Yuji
这项研究显示了在尖端增强拉曼光谱（TERS）测量中发生的纳米尺度脱氢的证据。在2,13-双（醛）[7]硫杂螺旋烯分子自组装单层上局部获得的近场TERS光谱显示，除了在1000 cm（-1）处的l模式为C - C三键外，其振动频率与密度泛函数理论计算的结果吻合较好，这表明苯环在实验过程中已经脱氢。通过峰分析，结合高分辨率STM成像得出的分子吸附取向，我们得出结论，侧向突出的苯环由于热解而脱氢，Ag尖端既是局部热源，也是催化剂。
This study shows evidence of nanoscale dehydrogenation occurring during tip-enhanced Raman spectroscopy (TERS) measurements. The near-field TERS spectra obtained locally on a self-assembled monolayer of 2,13-bis(aldehyde)[7]thiaheterohelicene molecules showed vibrational frequencies in good agreement with that predicted by density functional theory calculations, except for the L-mode at 1000 cm(-1), which is ascribed to a C C triple bond, implying that the benzene rings had been dehydrogenated during the experiments. Using peak analysis, incorporated with the molecular adsorption orientation deduced from high-resolution STM imaging, we conclude that one side benzene ring protruding upward was dehydrogenated as a result of pyrolysis, with the Ag tip serving as both local heat source and catalyst.